61244409 has 4 divisors (see below), whose sum is σ = 81659216. Its totient is φ = 40829604.

The previous prime is 61244401. The next prime is 61244473. The reversal of 61244409 is 90444216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61244409 - 2³ = 61244401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61244401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10207399 + ... + 10207404.

It is an arithmetic number, because the mean of its divisors is an integer number (20414804).

Almost surely, 2^61244409 is an apocalyptic number.

It is an amenable number.

61244409 is a deficient number, since it is larger than the sum of its proper divisors (20414807).

61244409 is a wasteful number, since it uses less digits than its factorization.

61244409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20414806.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 61244409 is about 7825.8807172100. The cubic root of 61244409 is about 394.1747637867.

The spelling of 61244409 in words is "sixty-one million, two hundred forty-four thousand, four hundred nine".